A dealloyed bulk FeNi pattern with exposed highly active facets for cost-effective oxygen evolution

Peng, Weiliang; Li, Yuyin; Luo, Zhengtang; Zhu, Min

doi:10.1016/j.apcatb.2022.122171

Cited by 20 publications

(6 citation statements)

References 50 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The peaks at 854.7 eV and 872.7 eV result from the Ni 2p 3/2 and Ni 2p 1/2 of Ni 3+ , and the peaks at 851.8 eV and 869.2 eV can be ascribed to the Ni 2p 3/2 and Ni 2p 1/2 of Ni 0 . In addition, the peaks at 857.8 eV and 876.0 eV belong to the multiplet-split of Ni 3+ 2p 3/2 and Ni 3+ 2p 1/2 , and the peaks at 861.3 eV and 879.6 eV are caused by the satellite peaks of Ni [ 39 , 41 ], which keeps consistent with the results of the XRD, and it further confirms the successful fabrication of the NiFeO x (OH) y . The XPS spectra of C, N, and O ( Figure S3a–c ) for FeO x (OH) y @NCA and NiO x (OH) y @NCA samples are almost identical to the optimal Ni 7 FeO x (OH) y @NCA sample.…”

Section: Resultssupporting

confidence: 81%

Electronic Modulation of the 3D Architectured Ni/Fe Oxyhydroxide Anchored N-Doped Carbon Aerogel with Much Improved OER Activity

Hao

et al. 2023

Gels

View full text Add to dashboard Cite

It remains a big challenge to develop non-precious metal catalysts for oxygen evolution reaction (OER) in energy storage and conversion systems. Herein, a facile and cost-effective strategy is employed to in situ prepare the Ni/Fe oxyhydroxide anchored on nitrogen-doped carbon aerogel (NiFeOx(OH)y@NCA) for OER electrocatalysis. The as-prepared electrocatalyst displays a typical aerogel porous structure composed of interconnected nanoparticles with a large BET specific surface area of 231.16 m2·g−1. In addition, the resulting NiFeOx(OH)y@NCA exhibits excellent OER performance with a low overpotential of 304 mV at 10 mA·cm−2, a small Tafel slope of 72 mV·dec−1, and excellent stability after 2000 CV cycles, which is superior to the commercial RuO2 catalyst. The much enhanced OER performance is mainly derived from the abundant active sites, the high electrical conductivity of the Ni/Fe oxyhydroxide, and the efficient electronic transfer of the NCA structure. Density functional theory (DFT) calculations reveal that the introduction of the NCA regulates the surface electronic structure of Ni/Fe oxyhydroxide and increases the binding energy of intermediates as indicated by the d-band center theory. This work provides a new method for the construction of advanced aerogel-based materials for energy conversion and storage.

show abstract

Section: Resultssupporting

confidence: 81%

Electronic Modulation of the 3D Architectured Ni/Fe Oxyhydroxide Anchored N-Doped Carbon Aerogel with Much Improved OER Activity

Hao

et al. 2023

Gels

View full text Add to dashboard Cite

show abstract

“…As depicted in Figure b, the signals of Mo 3d 5/2 and Mo 3d 3/2 of Mo 3+ , Mo 4+ , and Mo 6+ can be probed at the binding energy of 229.4, 230.0, 232.5, 232.7, 233.1, and 235.8 eV, respectively, for Ni/NiMoN. , However, after preoxidation, the signal intensity of Mo obviously decreases owing to dissolution and leaching of Mo element revealed in Mo-NiO and Mo-NiO@NiFe LDH, and the remaining Mo only maintains a valence state of Mo 6+ and substitutes for Ni atoms in the lattice of NiO, which can cause the formation of lattice distortion and the local charge redistribution around Ni sites, thereby exhibiting an increased number of active sites and remarkable charge transfer capability, making Mo-NiO a suitable support carrier for the constructing heterostructure with excellent OER catalytic activity . The Fe 2p spectra of NiFe LDH and Mo-NiO@NiFe LDH are displayed in Figure c, where the two peaks located at 712.4 and 725.7 eV are attributed to Fe 2p 3/2 and Fe 2p 1/2 of Fe 3+ for the Mo-NiO@NiFe LDH, respectively, which demonstrates a negative shift of 0.3 eV compared with NiFe LDH, indicating the existence of the strong electron interaction between Mo-NiO and NiFe LDH combined with the previous migration result of Ni 2+ . This strong electron interaction is beneficial for enhancing the rate of charge transfer through the heterointerface, thereby improving the catalytic performance of the Mo-NiO@NiFe LDH for oxygen evolution reaction (OER) .…”

Section: Resultsmentioning

confidence: 95%

“…34 Besides, two satellite peaks assigned to Ni 2p are detected in the described catalysts above, including NiFe LDH shown in Figure S10. As depicted in Figure 3b, the signals of Mo 3d 5/2 and Mo 3d 3/2 of Mo 3+ , Mo 4+ , and Mo 6+ can be probed at the 36 The Fe 2p spectra of NiFe LDH and Mo-NiO@NiFe LDH are displayed in Figure 3c, where the two peaks located at 712.4 and 725.7 eV are attributed to Fe 2p 3/2 and Fe 2p 1/2 of Fe 3+ for the Mo-NiO@ NiFe LDH, respectively, 37 which demonstrates a negative shift of 0.3 eV compared with NiFe LDH, indicating the existence of the strong electron interaction between Mo-NiO and NiFe LDH combined with the previous migration result of Ni 2+ . This strong electron interaction is beneficial for enhancing the rate of charge transfer through the heterointerface, thereby improving the catalytic performance of the Mo-NiO@NiFe LDH for oxygen evolution reaction (OER).…”

Section: Resultsmentioning

confidence: 99%

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

Ye,

Yuan,

Peng

et al. 2024

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Heterostructure catalysts are considered as promising candidates for promoting the oxygen evolution reaction (OER) process due to their strong electron coupling. However, the inevitable dissolution and detachment of the heterostructure catalysts are caused by the severe reconstruction, dramatically limiting their industrial application. Herein, the NiFe-layered double hydroxide (LDH) nanosheets attached on Mo-NiO microrods (Mo-NiO@NiFe LDH) by the preoxidation strategy of the core NiMoN layer are synthesized for ensuring the high catalytic performance and stability. Owing to the enhanced electron coupling and preoxidation process, the obtained Mo-NiO@NiFe LDH exhibits a superlow overpotential of 253 mV to achieve a practically relevant current density of 1000 mA cm −2 for OER with exceptional stability over 1200 h. Notably, the overall water splitting system based on Mo-NiO@NiFe LDH reveals remarkable stability, maintaining the catalytic activity at a current density of 1000 mA cm −2 for 140 h under industrial harsh conditions. Furthermore, the Mo-NiO@NiFe LDH demonstrates outstanding activity and long-term durability in a practical alkaline electrolyzer assembly with a porous membrane, even surpassing the performance of IrO 2 . This work provides a new sight for designing and synthesizing highly stable heterojunction electrocatalysts, further promoting and realizing the industrial electrocatalytic OER.

show abstract

“…However, the surface remains dense without any holes or pores, suggesting that the original Ni–Mo alloy possesses good etching resistance and it is difficult to continue the etching to form a porous surface without any additional means. It is reported that high-energy crystal planes tend to possess higher reactivity and faster atomic mobility, contributing greatly to ion exchange at the solid–liquid interface during dealloying for porous structures. − Therefore, prior to the dealloying step, it is necessary for the original Ni–Mo alloy to figure out the highly active crystal plane. XRD pattern of the original Ni–Mo alloy in Figure c shows that it is a solid solution of face-centered cubic Ni (PDF#01-3035) and contains three main indices of crystal planes.…”

Section: Resultsmentioning

confidence: 99%

In Situ Construction of Biphasic Boride Electrocatalysts on Dealloyed Bulk Ni–Mo Alloy as Self-Supporting Electrode for Water Splitting at High Current Density

Yang,

Peng,

Chen

et al. 2024

ACS Appl. Mater. Interfaces

Self Cite

View full text Add to dashboard Cite

Nickel−molybdenum−boron (Ni−Mo−B)-based catalysts with biphasic interfaces are highly advantageous in bifunctional electrocatalytic activity in alkaline water-splitting. However, it remains an ongoing challenge to obtain porous Ni−Mo alloy substrates that provide stable adhesion to catalysts, ensuring the long-term performance of bifunctional self-supporting electrodes at a high current density. Herein, a porous Ni−Mo alloy substrate was effectively obtained by a cost-effective dealloying process on a commercial Ni−Mo alloy with high-energy crystal planes. Subsequently, the Mo 2 NiB 2 /Ni 3 B bifunctional catalyst was in situ synthesized on this substrate via boriding heat treatment, resulting in outstanding catalytic activity and stability. Density functional theory (DFT) calculations reveal that the abundant biphasic interfaces and surfacereconstructed sites of the Mo 2 NiB 2 /Ni 3 B catalyst can decrease the energy barriers for the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Thus, the designed self-supporting electrodes show bifunctional catalytic activity with overpotentials of 151 mV for HER and 260 mV for OER at a current density of 10 mA cm −2 . Markedly, the assembled water electrolyzer can be driven up to 10 mA cm −2 at 1.64 V and maintain catalytic activity at a high current density of 1000 mA cm −2 for 100 h. The new strategy is expected to provide a low-cost scheme for designing self-supporting bifunctional electrodes with high activity and excellent stability and contribute to the development of hydrogen energy technology.

show abstract

A dealloyed bulk FeNi pattern with exposed highly active facets for cost-effective oxygen evolution

Cited by 20 publications

References 50 publications

Electronic Modulation of the 3D Architectured Ni/Fe Oxyhydroxide Anchored N-Doped Carbon Aerogel with Much Improved OER Activity

Electronic Modulation of the 3D Architectured Ni/Fe Oxyhydroxide Anchored N-Doped Carbon Aerogel with Much Improved OER Activity

Highly Stable Mo-NiO@NiFe-Layered Double Hydroxide Heterojunction Anode Catalyst for Alkaline Electrolyzers with Porous Membrane

In Situ Construction of Biphasic Boride Electrocatalysts on Dealloyed Bulk Ni–Mo Alloy as Self-Supporting Electrode for Water Splitting at High Current Density

Contact Info

Product

Resources

About